I installed a xo vision xod1750 double din touch screen stereo in my 2004 mustang but the sound plays really low with barely any base even when I turn it up to max, if anyone can help me, please and thanks!

Re check all the wires and make sure you have a good connection. But like the guy above me said its probably something not getting enough juice. Take it to a stereo shop and have them check your amps. The local guy I buy from checks mine for free.